package com.kylin.common.datascope.aspect;

import com.kylin.common.datascope.annotation.DataScope;
import com.kylin.common.datascope.context.DataScopeHolder;
import com.kylin.common.datascope.service.DataScopeService;
import com.kylin.common.datascope.service.Role;
import com.kylin.common.security.domain.LoginUser;
import com.kylin.common.security.util.SecurityUtils;
import org.apache.commons.lang3.StringUtils;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;


/**
 * 数据过滤处理
 *
 * @author wuhao
 * @version 1.0 - 2019-08-19
 */
@Aspect
@Component
public class DataScopeAspect
{
    /**
     * 全部数据权限
     */
    public static final String DATA_SCOPE_ALL = "1";

    /**
     * 自定数据权限
     */
    public static final String DATA_SCOPE_CUSTOM = "2";

    /**
     * 部门数据权限
     */
    public static final String DATA_SCOPE_DEPT = "3";

    /**
     * 部门及以下数据权限
     */
    public static final String DATA_SCOPE_DEPT_AND_CHILD = "4";

    /**
     * 仅本人数据权限
     */
    public static final String DATA_SCOPE_SELF = "5";

    /**
     * 数据权限过滤关键字
     */
    public static final String DATA_SCOPE = "dataScope";

    @Autowired
    private DataScopeService dataScopeService;


    // 配置织入点
    @Pointcut("@annotation(com.kylin.common.datascope.annotation.DataScope)")
    public void dataScopePointCut()
    {
    }

    @Before("dataScopePointCut()")
    public void doBefore(JoinPoint point) throws Throwable
    {
        handleDataScope(point);
    }

    protected void handleDataScope(final JoinPoint joinPoint)
    {
        // 获得注解
        DataScope controllerDataScope = getAnnotationLog(joinPoint);
        if (controllerDataScope == null)
        {
            return;
        }

        // 获取当前的用户
        LoginUser loginUser = SecurityUtils.getLoginUser();
        if (loginUser != null)
        {
            // 如果是超级管理员，则不过滤数据
            if (!"admin".equals(loginUser.getUsername()))
            {
                dataScopeFilter(joinPoint, loginUser, controllerDataScope.deptAlias(),
                        controllerDataScope.userAlias());
            }
        }
    }

    @After("dataScopePointCut()")
    public void doAfter() {
        DataScopeHolder.remove();
    }

    /**
     * 数据范围过滤
     * 
     * @param joinPoint 切点
     * @param user 用户
     * @param deptAlias 部门别名
     * @param userAlias 用户别名
     */
    public void dataScopeFilter(JoinPoint joinPoint, LoginUser user, String deptAlias, String userAlias)
    {
        StringBuilder sqlString = new StringBuilder();

        // todo 角色和当前的权限获取一个最大数据权限的值
        // 当前就允许选择一个对象
        LoginUser loginUser = SecurityUtils.getLoginUser();
        loginUser.getRoles();

        Role role = dataScopeService.getRoleByKey(loginUser.getRoles().iterator().next());

//        for (String role : user.getRoles())
//        {
            String dataScope = role.getDataScope();
            if (DATA_SCOPE_ALL.equals(dataScope))
            {
                sqlString = new StringBuilder();
//                break;
            }
            else if (DATA_SCOPE_CUSTOM.equals(dataScope))
            {
                sqlString.append(String.format(
                        " OR %s.dept_id IN ( SELECT dept_id FROM sys_role_dept WHERE role_id = %s ) ", deptAlias,
                        role.getId()));
            }
            else if (DATA_SCOPE_DEPT.equals(dataScope))
            {
                if(StringUtils.isNotEmpty(deptAlias)) {
                    sqlString.append(String.format(" %s.dept_id = %s ", deptAlias, user.getDeptId()));
                }else {
                    sqlString.append(String.format(" dept_id = %s ", user.getDeptId()));
                }
            }
            else if (DATA_SCOPE_DEPT_AND_CHILD.equals(dataScope))
            {
                sqlString.append(String.format(
                        " %sdept_id IN ( SELECT dept_id FROM sys_dept WHERE dept_id = %s or find_in_set( %s , parent_ids ) )",
                        StringUtils.isNotEmpty(deptAlias)? deptAlias + "." : "", user.getDeptId(), user.getDeptId()));
            }
            else if (DATA_SCOPE_SELF.equals(dataScope))
            {
                if (StringUtils.isNotBlank(userAlias))
                {
                    sqlString.append(String.format(" OR %s.id = %s ", userAlias, user.getUserId()));
                }
                else
                {
                    // 数据权限为仅本人且没有userAlias别名不查询任何数据
                    sqlString.append(" OR 1=0 ");
                }
            }
//        }

        DataScopeHolder.setContext(sqlString.toString());
//
//        if (StringUtils.isNotBlank(sqlString.toString()))
//        {
//            // todo 优化
//            Model baseEntity = (Model) joinPoint.getArgs()[0];
//            baseEntity.getParams().put(DATA_SCOPE, " AND (" + sqlString.substring(4) + ")");
//        }
    }

    /**
     * 是否存在注解，如果存在就获取
     */
    private DataScope getAnnotationLog(JoinPoint joinPoint)
    {
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method method = methodSignature.getMethod();

        if (method != null)
        {
            return method.getAnnotation(DataScope.class);
        }
        return null;
    }

    // todo 优化多个角色的时候处理方式
    private PreAuthorize getPreAuthorize(JoinPoint joinPoint) {
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method method = methodSignature.getMethod();

        PreAuthorize preAuthorize = method.getAnnotation(PreAuthorize.class);
        if (method != null)
        {
            return method.getAnnotation(PreAuthorize.class);
        }


        return null;
    }
}
